Pipe-slotting machine



Dec. 18, 1928.

B. C. TRAVIS PIPE SLOTTING MACHINE Filed May 1, 1924 IN VEN TOR.

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I to insure thatanythingWhichstarts through-' Patented Dec. 18, 1928 IBERTRAM orimvrsjor nos ANGELES, CALIFORNIA, Assienonor ma na MARK, LEVY, or Los'anentns;oariroamia.

s R" rrrE-sno'rrnve MACHI E; I

Appmcation medle a slot fromthe outside will l rave-n-oobstruc-' tion as it movesthrough the SlOtjbWliWllLfifiVE larger space as it passes through theouter face ofthe .slot. In effect, it is a sllot beveleid from the inside, but iwithmy new invention 1 amf able-to slotpipeior casing? with this kind of aslot and doitfrom theoutside of the pipe. In order to'clearlyexplainmy invention, I have illustrated one: machine, embodying my invention on theaccompanying' sheet of: drawings, in whiclm,*-

Figure 1 is aside elevation are. machine embodying my invention, in position over a pipe which is shown iii-vertical longitudinal sectional view, I

F'gure 2*is amend vieWof'the same mas; chine, showing the pipe in cross seetiion; and Figure '3 is a fragmentary sectionrof. awpilpe or casing showing the? form. of the s-l otjcutf by my n'ewmachind i p Referring in detail to the drawings showing-one embodimentof my invention, it will be understood that the broad idea is expressed in operating a saw or cutting element through, a pipe at two different angles, but entering the saw at the-same place both. times, from the outside in the present showing. In the drawings, a pipe P is shown securely held on a a table T by means of a shock block 10, with bolts 11', 11, and cross piece 12, thus making itpossible, by moving the table in the usual manner, to move the pipelongitudinally, also to move it vertically. The pipe can also beturned in its supported position. The machinery for supporting the pipe and for moving it and for permitting it to be turned to different positions may be of any suitable type and such machinery is in common usage and need not be described in detail in this specification.

In showing and describing this particular embodiment of my invention, I have shown two pairs of'saws, as 13,13 and 14,14, mount- 7 ed on two arbors, 15 and 16, carried inthe angular rocker arms, 17 and 17, movably mounted on a common or central shaft 18, the

' saw carrying arbors beingprovided at their opposite ends with drivinggears, as 19 and 1924;.v Serial mi 710,394.!

with gear 19for driving the saws 13,13; {An intermediate-gear 22' is carried in theganglular rocker arm 17, and 1s in: mesh-with the pinion 20,byWhichsaidsawslare driven Adrivi-ng I I v pinion- 21-. is shown'on' shaft :18, and meshes '2Land the gear 20, for'driving'thesaws 14, Mina direction opposite ,to' the d-irecti-on"of 1 rotation of the saws 1 3 any thrust'action on the pipe orcasing as said saws areforcedthereintoin theircutting aetion i" .p' p The upper ends of the: angular rocker arms ormembers are provided withwanti frirction arms: are 1 connected together by uneans of a, tension spring, 25,.wh1ch. operatesto return 13." "Thisi'e'qu-alizes cal th'esaid farmsand-saws to theirnormal or inoperative positions when they are released as hereinafter described; V

The driving shaft 118: is suitably mounted in the head Hof'themain machine'as showniin Fig.2, and isprovidedthereinwith a; driving I pulley26, turnin=g loosely thereon-,-;saiddriv ingpulley having secured thereto and turn: ing therewith a gear, 21,:which meshes with a gear 28, on ashaft29ewhich shaftis provided with a-p i nion.3 0,which'ineshes with a gear 31,; secured to said shaft 18, for driving thesame through saidtrain of gears fromthepulley 26 to saidgear 31. On the outer end of the shaft 29 is a beveled gear 32',.which meshes with a-similar gear 33 on the lower end of a verticalshaft, 33, which has a similar gear 34 on its upper end, in mesh with a beveled gear 35, on ashaft'36, provided with a worm 37, in meshwith a worm gear 38, on shaft 39. All of said shafts have suita'ble bearings in the main. machine. The cam 39 carries two cams of eccentric form, designated 40 and 41, and adapted to engage the anti-friction members 23 and 24, on

the upper ends of the'rocker arms or members,-

as'shown in Figs. 1 and 2,"and by: which said arms are moved downwardly in order to move the saws, 13, 13 and 14, 14, into the work, that is,intot hepipeP." q j Thus'it will be seen that the saws are mountf ed to swing'abo'ut the center shaft 18 as they move into the work, or pipe P, which permits 1 the saws to clear the work as they enter the the ee 1 05 i i keep the cuttings out of then beveled, as will be understood from the cut being made by said saws, 13, 13, in Fig. 2, and as more clearly illustrated in the enlarged fragmentary view shown in Fig. 3. Thus it will be seenthat the real heart of the invention is the idea of forcing a saw or other cut-- ting element through a pi e tocut a slot or opening and then forcin t e same oranother cutting element through at a different angle, whereby to provide a slot is larger than the outer end or border, that the opening will be of beveled or countersunk form on its inner side.

The operation of the machine may be briefly described as followszThe pipe is put in place under the saws. The machine is started and the two sets of saws are forced down through the pipe or casing in the positions shownin-Fig. 2, on opposite sides of the center. Thenthe pipe is rotated sufiiciently to put the cuts made by saws 14, 14, under machine is operated saws 13, 13, and the again and .thecut is completed in the form as illustrated in Fig. 3. It will be understood, of course, that any desired and suit able number of saws can be arranged for simultaneous operation, in order to increase! the output, but the principle involved is the same whether one or more sawsbe 0 rated, and while I have shown and descri ed but the same opening one embodiment of the invention in order to describe it, I do not limit the invention to the showing made except as I may be limited by the hereto appended claims.

Iclaimij 1. Ina machine of the character shown and described, including means for holding a pipe, rocker arms movably mounted to be movedto and from said pipe, pipe slotting tools carried by said arms, means for driving said pipe slotting tools, means for moving said arms towardlsaid pipe to force said cutting tools into said pipe, said tools being spaced from each other transversely of the axis of said pipe, whereby said pipe can be i i turned to position the cut made by one tool or opening in which the inner end or border 7 in. position to receive the other tool, for-the purpose described.

p 2. In a machine of the character referred to, in combination, meansfor holding a pipe to be slotted,operating armsmovable toward and from said pipe, slotting tools carried by said arms, means for driving said tools,

means for movin said arms and tools simul taneously-towar said pipe tocutthe same, said cutting tools beingspaced axially from each other and transversely of the-pipe, one 1 cutting tool operating on one side of thecen-- ter longitudinal axis and the other tool operating on the other side thereof, one of said cutting tools being operated in thesame slot a cut by the other tool when said pipe is ro-.

tated a distance equal to the space between said cuttingtools. I Signed at Los Angeles, Los An eles county, Galifornia,.this 22 day of Aprii, 1924.

BERTRAM C. TRAVIS. 

